When several computers share a single broadband connection (some wirelessly), is there a way to set a user-defined upper limit (either in absolute Kbps/Mbps or relative %) on each one's bandwidth usage?
There are both software (installed on each PC, ex: http://www.netlimiter.com/) as well as hardware (routers with QOS features, ex Linksys RVS4000) solutions to this depending on which way you want to go (and how much you are willing to pay)